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发明名称
Phonographic dictation machine
摘要
申请公布号
US2075592(A)
申请公布日期
1937.03.30
申请号
US19330699412
申请日期
1933.11.23
申请人
SPEIR ROBERT J
发明人
SPEIR ROBERT J.
分类号
G11B25/02
主分类号
G11B25/02
代理机构
代理人
主权项
地址
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